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System and driving method for light emitting device display

  • US 10,555,398 B2
  • Filed: 11/30/2017
  • Issued: 02/04/2020
  • Est. Priority Date: 04/18/2008
  • Status: Active Grant
First Claim
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1. A display system comprising:

  • a pixel array having a plurality of pixel circuits, each of the plurality of pixel circuits being configured to be operated in a programming cycle, during which each pixel circuit receives a programming voltage according to display data, and operated in a driving cycle different from the programming cycle, during which each pixel emits light according to the programming voltage, each pixel circuit comprising;

    a light emitting device;

    a capacitor having a first and a second terminal, the first terminal of the capacitor coupled to a signal line;

    a first switch transistor having a gate terminal, a first terminal, and a second terminal, the gate terminal of the first switch transistor coupled to a select line, the first terminal of the first switch transistor coupled to the second terminal of the capacitor, the second terminal of the first switch transistor coupled to the light emitting device;

    a second switch transistor having a gate terminal, a first terminal, and a second terminal, the gate terminal of the second switch transistor coupled to a select line, the first terminal of the second switch transistor coupled to the light-emitting device, the second terminal of the second switch transistor coupled to a bias line; and

    a driving transistor for driving the light emitting device, the driving transistor having a gate coupled to the second terminal of the capacitor; and

    driver circuitry for programming the pixel circuit during the programming cycle and driving the pixel circuit during a driving cycle, the driver circuitry providing programming voltages on the signal line as a function of the display data for the pixel circuit, and providing a controllable bias current, independent of programming data for the pixel circuit, on the bias line to compensate for spatial and temporal non-uniformities of the pixel circuits.

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